Contents

• NAME
• SYNOPSIS
  • F95 INTERFACE
  • C INTERFACE
• ARGUMENTS

NAME

     dcosti - initialize the array WSAVE, which is used in COST.

SYNOPSIS

     SUBROUTINE DCOSTI(N, WSAVE)

     INTEGER N
     DOUBLE PRECISION WSAVE(*)

     SUBROUTINE DCOSTI_64(N, WSAVE)

     INTEGER*8 N
     DOUBLE PRECISION WSAVE(*)

  F95 INTERFACE
     SUBROUTINE COSTI(N, WSAVE)

     INTEGER :: N
     REAL(8), DIMENSION(:) :: WSAVE

     SUBROUTINE COSTI_64(N, WSAVE)

     INTEGER(8) :: N
     REAL(8), DIMENSION(:) :: WSAVE

  C INTERFACE
     #include <sunperf.h>

     void dcosti(int n, double *wsave);

     void dcosti_64(long n, double *wsave);

ARGUMENTS

     N (input) Length of the sequence  to  be  transformed.   The
               method  is  most efficient when N - 1 is a product
               of small primes.  N >= 2.

     WSAVE (input)
               On entry, an array of dimension (3 * N  +  15)  or
               greater.   DCOSTI  is  called  once  to initialize
               WSAVE before calling DCOST and need not be  called
               again between calls to DCOST if N and WSAVE remain
               unchanged.  Thus, subsequent  transforms  of  same
               size  can  be obtained faster than the first since
               they  do  not  require   initialization   of   the
               workspace.